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How-To: Run ECMSDK against a RAC cluster

Using ECMSDK in a production environment often requires a robust, reliable and failover enabled repository. When using Oracle Real Application Cluster (RAC) with your ECMSDK repository you need to have a specific configuration in place to support such a setup. This post will explain the configuration steps required when running ECMSDK with Oracle WebLogic Server (WLS).

In the previous CMSDK version a RAC enabled connect string looked like this:

(DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = rac1)(PORT = 1521)) (ADDRESS = (PROTOCOL = TCP)(HOST = rac2)(PORT = 1521)) (LOAD_BALANCE = NO) (FAILOVER = ON) (CONNECT_DATA = (SERVICE_NAME = rac) (failover_mode = (type=select)(method=basic)) )

ECMSDK makes use of data sources to connect to the underlying database. These data sources are configured inside your Application Server, such as Oracle WebLogic Server.
In Oracle WebLogic Server, a single data source implementation has been introduced to support an RAC cluster. It responds to Fast Application Notification (FAN) events to provide Fast Connection Failover (FCF), Runtime Connection Load-Balancing (RCLB), and RAC instance graceful shutdown. XA affinity is supported at the global transaction Id level. The feature is called WebLogic Active GridLink for RAC; which is implemented as the GridLink data source within WebLogic Server.

This GridLink data source also works with Oracle Single Client Access Name (SCAN). SCAN is a feature used in RAC environments that provides a single name for clients to access any Oracle Database running in a cluster. You can think of SCAN as a cluster alias for databases in the cluster. The benefit is that the client’s connect information does not need to change if you add or remove nodes or databases in the cluster.

The ECMSDK documentation describes how to create a regular JDBC data source named jdbc/OracleDS. Please refer to the following document which describes in detail how to create a GridLink data source in WLS.